\\[-1.8ex] Soil Heterogeneity & $-$0.245 & $-$0.155 & $-$0.202 & $-$0.229 & $-$0.255 & $-$0.260 & $-$0.264 \\ 
  & (0.172) & (0.172) & (0.171) & (0.171) & (0.173) & (0.174) & (0.176) \\ 
\\[-1.8ex]
Observations & 21,671 & 21,671 & 21,671 & 21,671 & 21,671 & 21,671 & 21,671 \\ 
R$^{2}$ & 0.607 & 0.607 & 0.607 & 0.607 & 0.607 & 0.607 & 0.607 \\ 
